[Bug 292769] net/rosenpass: do not try to load if_wg

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292769

            Bug ID: 292769
           Summary: net/rosenpass: do not try to load if_wg
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: fuz@FreeBSD.org
          Reporter: rob2g2-freebsd@bitbert.com
          Assignee: fuz@FreeBSD.org
             Flags: maintainer-feedback?(fuz@FreeBSD.org)

/usr/local/bin/rp tries to load if_wg if it detects FreeBSD as operating
system. This prevents it from being used inside a VNET jail.

The following diff removes the first "frag" section and prints an error if the
wireguard interface cannot be created (which is also the case if the if_wg
module is not loaded):

227,230d226
<       frag "
<         # load the WireGuard kernel module
<         kldload -n if_wg || fatal 'Cannot load if_wg kernel module'"
<
233c229
<         ifconfig wg create name $(enquote "${dev}") || true"
---
>         ifconfig wg create name $(enquote "${dev}") || fatal 'Cannot create wg interface'"


After applying the patch in case if_wg is not loaded, we get an error:
ifconfig: SIOCIFCREATE2 (wg): Invalid argument
FATAL: Cannot create wg interface
Usage: /usr/local/bin/rp
ifconfig: interface rosenpass0 does not exist

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